Good question / point.
I don't think anyone I know of has stopped drinking because I got sober, but a good friend of mine was at my one year medallion. Apparently he got inspired to be part of an eating program and isn't 12-step based, but has meetings and the men keep each other accountable. They support each other and all aim to achieve the same goal - healthy weight loss. I saw him for dinner last night and he's almost unrecognizable. But he said it was from seeing everyone in that room and feeling the energy in there.
I want what he has now!